mpg vs mph: prius graph

[MetroMPG]

i REALLY want to do this for my car. seems like pretty important baseline info to have for any car.
i did a quickie a few weeks back - covering just 3 speeds, though.

i'd like to know this info for top gear from, say 55 km/h up to 105 km/h in 5 km/h increments.

i almost did this on saturday morning, because it was very calm, wind-wise. but had other projects underway already. probably my next calm-day data-run.

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commenting on the prius graph... i don't understand the sharp drop around 42 mph. i suspect it has to do with the ICE being spun up to protect the MG set from overspeeding. but if that is the case, are the MPG figures at lower speeds electrically assisted? krousdb, can you comment?